Various tumors and tumor-like lesions of bone and cartilage were examined for S-100 protein using the avidine-biotin-peroxidase complex (ABC) immunostaining method. The most intense reactivity for S-100 protein was found in well-differentiated chondrocytes of enchondromas, osteochondromas and
Using the peroxidase-antiperoxidase (PAP) immunohistochemical method, S-100 protein was found in well-differentiated chondrocytes of chondroma, chondroblastoma, mesenchymal chondrosarcoma, and osteosarcoma. It was not detected in osteoma, osteoblastoma, giant cell tumor, and Ewing's tumor. The
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